.index {
  height: 100%;
  display: flex;
  position: relative;
}

.index .left {
  background: #333;
  width: 30%;
  text-align: center;
  color: white;
}

.index .left ul li {
  height: 50px;
  line-height: 50px;
}

.index .left ul .active {
  color: white;
  background: tomato;
}

.index .right {
  width: 70%;
  position: relative;
  overflow: auto;
}

.index .right .none {
  display: none;
}

.index .bt {
  position: absolute;
  bottom: 0;
  background: pink;
}
